Despite the huge growth in volume of evaluations published by humanitarian actors, the evaluation system still struggles to provide evidence about collective performance of the humanitarian sector.
Evaluation synthesis provides one option for building information about response-wide performance. They aggregate findings from a defined range of evaluations using a specific analytical framework and typically seek to provide digestible lessons for senior management by drawing on findings from multiple projects and interventions. In short, they help us to learn from what we know.
This ALNAP paper provides guidance on when and how to do an evaluation synthesis.